Patents by Inventor Martin E. Wacha

Martin E. Wacha has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Writing instrument
    Patent number: 5551788
    Abstract: A writing instrument with an advance-retract mechanism is operable by rotation of a knob opposite the writing tip. The knob rotates a shaft disposed in, and extending rearwardly from, the instrument body to advance and retract the writing tip when rotated. A retainer member has a first cylindrical portion with a plurality of inwardly extending tangs into which the shaft is received and a larger cylindrical portion having a surface directed toward the instrument body.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: September 3, 1996
    Inventors: Martin E. Wacha, Evan K. Pennell
  • Projection-retraction mechanism for a writing instrument
    Patent number: 4529328
    Abstract: A two-part barrel sleeve includes an internal spring finger which rides in a spiral groove in the combined ink reservoir and barrel of a ball pen, the spiral groove having a detent at its rear end to provide a snap-action as the barrel sleeve is retracted to its rearmost position exposing the writing tip for normal use.
    Type: Grant
    Filed: September 6, 1983
    Date of Patent: July 16, 1985
    Assignee: The Parker Pen Company
    Inventors: Martin E. Wacha, Jerry W. Digney
  • Fountain pen nib
    Patent number: D252464
    Type: Grant
    Filed: December 5, 1977
    Date of Patent: July 24, 1979
    Assignee: The Parker Pen Company
    Inventors: Elmer D. Thompson, Martin E. Wacha
  • Barrel tip assembly for a ball point pen
    Patent number: D252634
    Type: Grant
    Filed: December 5, 1977
    Date of Patent: August 14, 1979
    Assignee: The Parker Pen Company
    Inventors: Robert J. Fanella, Elmer D. Thompson, Martin E. Wacha
  • Mechanical pencil
    Patent number: D286789
    Type: Grant
    Filed: May 9, 1984
    Date of Patent: November 18, 1986
    Assignee: Parker Pen (Benelux) B.V.
    Inventors: John Thompson, Martin E. Wacha
  • Automatic pencil
    Patent number: D288825
    Type: Grant
    Filed: September 17, 1984
    Date of Patent: March 17, 1987
    Inventors: John Thompson, Martin E. Wacha